Question

what is abacus and its components​

Answer 1

Abacus is made up of a frame with vertical rods on which beads move up and down. Dividing the upper and lower portion of the abacus is a horizontal bar called a beam or reckoning bar . On a modern-day soroban, one bead sits above the beam and four beads sit below.

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Answer 2

Answer:

Each rod has 5 beads. The abacus is divided into the upper and the lower part by a horizontal bar called the Beam. The beads in the lower part are the Lower Beads or the Earth Beads. The beads in the upper part are the Upper Beads or the Heaven Beads.

Explanation: